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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '312c33acb3cf15510a71c1e50b65451c9509d4bee549a867b5387cabbbad5bfa' 
  AND token = 'Z2a2oEljY7m/QO4yqMxJ1RSpdc5QY3s2o67cSxWjBTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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