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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '779c5c8cead2e96fa374985b70f40b27f20165f5216958fbb5310d69ff8ad353' 
  AND token = 'kww8j90kazZ7JI/Uhx1X3RKSORE3tiv0AQ947tA7NP8=' 
  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"
    }
  }
}