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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0134c8c1ce10d350d1edf72fd0a5cc27902d2ed5c4ef6191db3ac5626f341349' 
  AND token = 'cr46yAyot8jnb+WYdzT2JoBRRx16s8LNtpXyDwNlHJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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