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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a95e3a139f7eb44a34a069ac0cf56f32f6b1e44caf68a70a51b46e189d09df7' 
  AND token = 'bp2D1eCEp1W8y1WyDSL3hkSZ7wIWfdisw1Li2U3ljtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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