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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '723674449dc3bf42070a7b887a3122bb4f24cfce09c5e1a8b788170854e4662a' 
  AND token = '96nX1bHEoDCp4NCz6s68SZ2MFHSV7SsagvNonL+Oel4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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