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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4772bd224c5de4130f0c6b0eef13f62eaabee3ce77a9ae33c9633bed7dc011a' 
  AND token = 'CH6nS67Qq0KSaIWnwRSS++GdeGGGlDvs9fwwqfi/QF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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