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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '991403887455d4ec4c23398e4a72a2c8200ec05554f7889557537d32954133f2' 
  AND token = 'B475fGSI6rgwmOpSY8HL4dc43krLUu3ymRanmHEM2ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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