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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73c9add3626af64a9a71140847f2db9798c03f0a3ce3f2cbd30a82d2d6d0c5d9' 
  AND token = 'tn3B1GhvcbU/AJen0Sj8NemyedA1Yr/PnEQvmos1T+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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