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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6617a7fd093b7a407d3e3038cd2162188ba8c9b4779bd6b267d7335c9a3c7d15' 
  AND token = 'EKJlMQinn0nY8H33+8PcUIMrjQYdqsfA4tBiERBzQZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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