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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae352b3398d3cae92f8a94c412c2a47a404c9917e82555b63c6a84b5cd2aa4a' 
  AND token = 'NxoRyF4bJOftSWdKQZLTwXy0XAj9KXsYMnANR641BFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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