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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51671792fa4321d6d31e53b8d7745d0e82c28fd48df3e9766dc2d7a7c38e9f24' 
  AND token = '7wLWkOW1vggxaOnU1+T4Z+YxxMfb54o9G2PXz6nRR2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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