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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7911f70eb25541ab3b965c80edad907dc9504fff0f45121a605aff1ca397ef85' 
  AND token = '/i7l8eelKWKCeMALCr9T/tObRb+ofWy1+q65Og48Ahk=' 
  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"
    }
  }
}