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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efdf9c4df54ddf6b08e93706ff0ee281ed70d6cdf97b897b2b969fac25b68f55' 
  AND token = '0yYFQltntNWhA5SQCsQk31ZS8QwivI8DFraKH9sGQOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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