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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e6af42842f51dd3a9bd707542b924e32254d25a494bbf0e0da18dadd77ddf5' 
  AND token = 'pfzPsB+29K/Rp28EXGNc24dUF8YM67Y+zbEMKLmXisg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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