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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48c6e50ea563336b9b82e97a61b7dbf752f2c131c06f5cd36cef45e24f2257a0' 
  AND token = 'v3ejR5b4Y5SI5GpFFL79TF4DQb1AIOmDIlksz8bsI1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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