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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9a0531e4647676661bdde9976b76fc709a27c00aa719a35672ab4ce2f0b8b14' 
  AND token = '0k+49uiSdA0AkO/1cwDW4TABA41L3CXos9GVO3tqmQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}