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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c38fb0851b33511008e398e7b5bf52d0c96ae132e5d4247caf3d043752c1986a' 
  AND token = 'ZC2Z1XyN2h5uexntHskjIuIk2AhyDyAx+RFba+PpPNA=' 
  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"
    }
  }
}