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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '262ec5feadfbd43babefe5e30eaaf9e5d6083222ca431238e7d2e6f25507f963' 
  AND token = 'SjmJAGssSadfGr4q+CuoV4UXekHFnl/fBjpYlYCbzQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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