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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8ccc67f36a0065d1fb99f8897e7bf6d59dfab962e42330009cb39a9a35ee5d2' 
  AND token = 'hl93s1dz9EYWMlkYE6soXkfZ5S1FFtDpE8uPAljKGxM=' 
  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"
    }
  }
}