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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a70ac9078bfab7a4b66038296a8e84a9003f815dceb220fe603e3dc0b2e2942e' 
  AND token = 'ElxDsYE2cvvprTF7tvsIuiD4Cj/Y9oacxlwCIVoNLb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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