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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a8d1d953624173e4e5ed410d626b85723ad37a7dac8ab560026476ab1fb0a1a' 
  AND token = 'JQAUdxBZCIa6yu/Ebu15kpfLvMYCkZX7KS/ANgGD2i8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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