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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b475e3ba5114220f5e555c94d8def32853bc0a00420bed6cbd61d16758d7df' 
  AND token = 'PBMlNF+phPEYG9+AcyodeHQa4iXRXrNNF+1uIH5r1sY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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