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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25a1c50426d3913754cb815033f4538b8b39f863b0c17876605e1e762ce3668' 
  AND token = 'oFU1ec/yobS1hf9+AQy1pyDiUGuSMBc8hXtkZM+Lw54=' 
  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"
    }
  }
}