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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4aa53b75327f340eb93d521e96f38b2ab962a9a4b0eaf1a14dfd342fe8735ce5' 
  AND token = 'i7YAcyMJnhJGxFyg/bHjzSbNOky51iAmDWnPIO4jPO4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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