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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814a8a755f2dc455c4ba7ac21570d3788d956f43f7a79e19af625892055e60bd' 
  AND token = 'Y+20bzWQ7SCkdh5dc0gCSTdz5g4BEaLif+HqaGLls1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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