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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0294c49068dd9fd820484c5b16002d62f0dcb8826146fec6ab3b7ee6d3f4c02b' 
  AND token = 'yokXQIMSRKgJ94wvMise/Ik7SIoDNhGvjib64ijJbB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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