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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8fac374b0f9dea84e90448d2e6f83539f2047c67628c2c9997eda57b3bb9be2' 
  AND token = 'GX3gszO6GOXwLoB5b+x8SWnTqwInby/ZezMiUy2gkyk=' 
  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"
    }
  }
}