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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '740c9b53c6b54a8364cea70f379b2975b7038fd19ace35a1f3a3f6d35fdb68e0' 
  AND token = 'ObyoUBqlojqUWu62WqptQAmJZt4wM1vuWnbPowdc9Ek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00186

JSON explain

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