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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3a8d72b5a6b55ecb2c852103c2ad09e3318441e51d1e6046be6a5817506e3d4' 
  AND token = 'yV9YPG0nTv931sHLLPfXh0f7waQE1S51NcWlAGEi3FQ=' 
  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"
    }
  }
}