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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb3fb37f3396f3661a2ef8f7d2bed19decf62dc4b53f1827ea0ac9927dde9bef' 
  AND token = 'XDCjqV35NUoBxoWsE83BHXHvJkLDN0AS4B3SGud/wao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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