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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f85d6332f89a1e0ed130c4ebb4eb0b0de108e07bfd1f88e688b34df5b0edf65e' 
  AND token = 'CeDBg/9434QgvbvUjxq/29dfubzXKVHkl+inMxuSCtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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