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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1436e14611e0a1d390aad05d4516a2c54f552d681aef44cf78811b3fbd344b4d' 
  AND token = 'MEmuf+p+0sowcifasfHjLeAj6IFlmXCX03/f2J4xAnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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