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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d23d69b387586f44248f4db5bf67acd8f32ae3538f034931422ffcd07b6a2c2' 
  AND token = 'Y5FlOpo5OLLLZ4A/E3FI022GuVar5HM4exfjGeJqyEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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