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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c82bc41f2f1b47ef97e3644f3f11db3b8a1765c3e179c2f75cb2f29bcf9017b' 
  AND token = 'sH0SD7kQ81uSM/malHB3oppJGzbgJFO++TzKAcQz3oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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