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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e7eeb686fefbb8126be83f38ebba47d1fddf97d2c199fb53d5fba815e6de4fd' 
  AND token = 'Uz1FOBdZI66/nLJgDXtZ+aNMDa7vVWJi+j7q8D7iy0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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